There are approximately 50-60 men at the fort. The only ways to get to the fort are across a bridge under Amareth fire, or up a nearly sheer, 300' cliff. The Amareth have cannons, though their shot may be limited. They have access to water and have some gardens, making a siege tricky. The only way into the fortress is through a heavy iron portcullis. The fort's has two towers that would allow Amareth archers to fire down on anyone trying to enter through the portcullis, or commit such niceties like dumping oil and fire down. The Amareth also seem to have a cleric who can heal or create food, making a siege even more tricky. We will have the cover of trees on our side of the cliffs, making it difficult for them to simply trade arrows with us, but the cannons could be trouble there. They also seem to have a wizard. The portcullis is heavy, and must be opened from inside the fortress or broken down. That fort is one of the most defensible locations in the region.